Xbench 3.0 Trial - Problem with a device

The issue is:
I was using Xbench 3.0 Trial Version and the 30 days period expired. OK, I got it, but when some other user is trying to get a new Trial Period with other accounts on this PC it says that “This device cannot be used for more user trial periods”. It sounds weird and ridiculous as many users can share one PC during the day. Please advise how to handle it.